Switch Off Mobiles image

Switch Off Mobiles

Do Not Switch Off image

Do Not Switch Off

No Naked Lights image

No Naked Lights

No Unauthorised Persons Beyond This Point image

No Unauthorised Persons Beyond This Point

Do Not Close image

Do Not Close

No Entry Ventilate First image

No Entry Ventilate First

Smoking Strictly Forbidden image

Smoking Strictly Forbidden

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